1925 (April 21-22), Airship (Z.R.3) Los Angeles First Flight three covers from Lakehurst to Bermuda, franked by one or two stamps, tied by Air Mail Service New York Apr.15.1925 or Apr.18.1925 (not listed in the Cat.) or normal Lakehurst Apr.20.1925 date stamp (not listed in the Cat.), each one with Hamilton ''22.APR.1925'' machine arrival marking on reverse, mostly VF, Sieger #20N, var, Est. $300-$400 (Image)